Prism the XULRunner-based SSB looks to be getting an update soon with some new features on the way:
- WebApp icon support – When installing a webapp, Prism will use the favicon of the webapp, if you want it to. You can also use a custom image too.
- Dock badging support – Support has been added to
allow Prism webapp.js code to add a textual badge to the OS X Dock
icon. This has not been exposed to the web content, only the Prism
webapp script. We want to explore ways of allowing web content to more
directly access this feature. - Minimize to tray – A new webapp.ini setting will
allow the Prism window to be minimized to the Windows system tray. We
want to explore ways of allowing web content to more directly access
this feature, such as, adding context menus and custom tooltips to the
system tray icon. - Separate profiles – Prism now places each webapp
into its own process/profile. The user can group webapps together when
installing, if they want webapps to share a profile. - Bug fixes – Thanks to everyone who has been filing bugs and feature requests.
We also have a Firefox extension version of Prism coming out. The
extension contains the full Prism runtime, but allows users to create
Prism-webapps from Firefox – and uses Firefox as the runtime (no
XULRunner needed). Prism Firefox extension features include:
- Simple install – User can manually choose to install the current website as a Prism webapp.
<link>support – The extension will scan any
tags found on a web page for webapp bundles and ask the user if they’d like to install the webapps.- One-click bundle install – Clicking on a hyperlink that points to a webapp bundle, should prompt the user if they’d like to install it.
A new update and a Firefox extension to boot? Sweet! 
[Prism changelog via StarkRavingFinkle.org]
